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But along the way, they were supported by celebrity blogger Perez Hilton, author Lynne Bradley and even the Rebel Girls themselves, Francesca Cavallo and Elena Favilli.

Speaking to Dublin Live about the adventure, Gavin said: "We got to the airport three hours ahead, got some breakfast and then went to Visa check. That's when we had issues, even though we'd travelled four or five times before.

"So I called a friend, and we jumped on the boat. There was no issue. We drove to the port, we went from Holyhead to Birmingham and then the train to London. It took us 14 hours to get to the signing.

"Everyone knew who we were when we arrived at the signing. Jade was the centre of attention. We had bought the Rebel Girls books previously, it was great."

Jade as a firefighter (Image: Gavin Leonard/Not Just A Princess)

But the excitement was not over, as the family faced another long journey home.

Gavin said: "We spent two days snowed in in Birmingham. Then we drove to Chester, and the engine started smoking. Then we had to call the AA to fix the car."

Not Just a Princess gets a lot of support from the public, including messages. There have been lots of illustrations done for Jade, and she is the character in each one.

And Gavin plans to bring his daughter on even more adventures, including a visit to Kilmainham Gaol and learning to be a DJ.